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Maniphest T68349

Slow subdivision surface modifier
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System Information
win 10 64 updated, i9 9900k rtx2080ti 32ram running on m2 ssd

Blender Version: Official V 2.80

I found an interesting bug that have to do with geometry.

In left I have the same geometry as in the right, but with extra caps.
However the differance is in performance, as when I move a vertex in left is really slow.
But if you try to move a vertex in the right object you will find that is work fast and reposnsive.

Video demonstration: https://www.youtube.com/watch?v=mbhb0g6UlF4&feature=youtu.be

I have attached the file as well.

slow.blend1 MBDownload

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Event Timeline

pistol ioan (pistoltoto) created this task.Aug 7 2019, 4:01 AM
Philipp Oeser (lichtwerk) lowered the priority of this task from 90 to 30.Aug 7 2019, 11:17 AM
Philipp Oeser (lichtwerk) added projects: Modifiers, Modeling.
Philipp Oeser (lichtwerk) added a subscriber: Philipp Oeser (lichtwerk).

There are known performance issues with the subdivision modifier, see T58191.

However, this file also has some non-optimal modeling for the caps [non-clamped bevels etc.,]
Here is a file that has the caps [not claiming visual parity to you file, but I hope you get the point] and is still reasonably fast:

slow_phi.blend1 MBDownload

That being said, it would be good to have a simple file that shows when exactly these slowdowns are introduced.
In your file, there might be lots of operations done from the fast to the slow version, making it very hard to reproduce where exactly this happens...

Will mark for "needs information from user" until we have simple reproduction steps in regards to where slowdowns are introduced...

Philipp Oeser (lichtwerk) renamed this task from Slow editing to Slow subdivision surface modifier.Aug 7 2019, 11:17 AM
pistol ioan (pistoltoto) added a comment.Aug 7 2019, 11:35 AM

I'm disappointed...

Philipp Oeser (lichtwerk) added a comment.Aug 7 2019, 12:17 PM
In T68349#747416, @pistol ioan (pistoltoto) wrote:

I'm disappointed...

@pistol ioan (pistoltoto) : why is that? You can still help track down the issue, and generally the subd issues are a known thing to be tackled sooner than later...

Bastien Montagne (mont29) changed the task status from Unknown Status to Archived.Aug 20 2019, 12:07 PM
Bastien Montagne (mont29) claimed this task.
Bastien Montagne (mont29) added a subscriber: Bastien Montagne (mont29).

More than a week without reply or activity. Due to the policy of the tracker archiving for until required info/data are provided.